My psp ran smoothly under oe3.40-a/psp290/mapthis v0.5. yesterday bad happened. After I ran a file to convert a game to a chinese fonts'. The PSP menu partially changed to chinese version and ISOs cant be run anymore. It didnt work either, after I converted it back. But others are ok. Map this and PSXs can be run. I suspected the damn program changed some psp system files. Then I downgrade the psp to 1.50 through recovery menu, a blue screen showed up and I was asked to clike O to restore the system files. Then I upgrade psp to OE-3.40a again. Then the ISOs are still not able to be run, and even Map this is crashed when map was loading. I really have no idea what to do Any suggestion would be appreciated. Update to 3.52-M33?